Maps of Meaning says that myths have a tremendous unseen value. They laid the foundation for large, stable and successful civilizations that lasted thousands of years. Myths also provide time-tested wisdom to help us eradicate evil in the social world, and move past unpredictable catastrophes in our personal lives.
Food of the Gods says psilocybin mushrooms were responsible for the unusually fast evolutionary growth of the human brain. Also it talks about how our relationships to psychoactive plants (including caffeine, sugar and alcohol) shaped human cultures. Finally, how we may restore personal, social and ecological balance in the world.